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Firstly is this a petrol or diesel if it's a diesel it's probably the alternator pulley failure due to collapsed bushes to check this u will need to remove the intercooler to check. If it's ok get hold of a multemeter and place the rd lead on the main pwr lead on the alternator and the black lead on the body of the alternator start the engine if u have battery voltage around 12 vthen the alternator isn't charging. U should see 14vto14.5v this check will work on the petrol

remove the intake manifold ,remove radiator ,remove radiator intake and outake housing, remove fan ,remove all belts: power steering, alternator and if you have a/c, remove harmonic balancer ,remove timing belt covers, remove timing belt remove intake housinng once you have remove all the above, your freaken engine will look naked, you can see the location of the knock sensor is locate in the engine valley

Just took one out last night. It also was stuck. Had to use small pry bar to get off the front mount. Sprayed the mount with PB blast to help. You do have to use some force, becareful not to break any electrical connections. Once the front mount was free, I had to pry up on it using a small hatchet. Only thing that would fit and actually be able to pry. The alternator became twisted from prying only on one side, so I used a block of wood and tapped it back straight. It finally released from the mounts and came loose. Then the fun begins in trying to actually get it out. Had to disconnect everything around it, took two people and alot of twisting and turning. Not looking forward to getting it back in. Removal took over 2 hours.